To reproduce: execute the following URL: http://localhost:8080/xwiki/bin/export/Space/Page?format=html&pages=%25.%25&name=AllPages&filter=installedExtensionDocument
What happens is that {{getNodeReference(}}} will return {{xwiki:%.WebHome}} and {{getChildren()}} will return an empty set since it's trying to find all docs under that node but it contains a {{%}} which is not considered a wildcard and thus it won't match anything.
cc [~mflorea] who implemented this code.
Also, the {{filter}} parameter is not documented at https://www.xwiki.org/xwiki/bin/view/Documentation/UserGuide/Features/Exports#HHTMLExport |
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